I just booked tickets to see this and can't wait. Basic premise - Shane Meadows spent five days following and documenting Paddy Considine, who was in character, whilst he roadied for Arctic Monkeys. Here's a pretty old teaser:

http://www.youtube.com/watch?v=1f-HRG-kahs

Considine + Meadows x Low Budget Mockumentary - Everything about this points towards it being a classic.